Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS4721569 A
Publication typeGrant
Application numberUS 07/039,969
Publication dateJan 26, 1988
Filing dateApr 17, 1987
Priority dateApr 17, 1987
Fee statusPaid
Publication number039969, 07039969, US 4721569 A, US 4721569A, US-A-4721569, US4721569 A, US4721569A
InventorsJere Northrop
Original AssigneeZabion, Ltd.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Phosphorus treatment process
US 4721569 A
Abstract
A process is disclosed for decreasing the phosphorus content of an aqueous influent stream containing biodegradable substrates, comprising adding to said stream previous aerobically enhanced and anaerobically stressed bacteria; dividing said stream into separate first and second streams; treating the first stream in an aerobic zone, in the presence of sufficient oxygen, for a time sufficient to cause enhancement of the bacteria to take-up phosphorus in excess of their growth requirements; treating the second stream in an anaerobic zone containing less than about 1 ppm of oxygen, for a time sufficient to stress the bacteria and cause release of phosphorus which is nonessential for the bacteria growth requirements; intimately mixing said treated first and second stream; holding said mixed first and second streams to allow settling of precipitants; removing liquid effluent from the upper portion of the settled stream; removing high solids content sludge, containing bacteria and phosphorus from the lower portion of the settled stream; and, recycling a portion of sludge containing bacteria to the aqueous influent stream. Such process acts to synergistically increase the efficiency of phosphorus removal, without addition of costly chemicals, by significantly increasing the amount of phosphorus taken-up by bacteria.
Images(1)
Previous page
Next page
Claims(15)
I claim:
1. A process for the treatment of an aqueous influent stream containing bacteria, phosphorus and biodegradable substrates, comprising adding to said stream aerobically enhanced and anaerobically stressed bacteria; dividing said influent stream into at least two separate streams; treating at least one of said separate streams in an aerobic zone in the presence of sufficient oxygen and for a time sufficient to cause the bacteria contained in the stream to take-up phosphorus in excess of their growth requirement; treating another of said separate streams in an anaerobic zone, under oxygen deficient conditions, for a time sufficient to stress the bacteria contained therein and cause release of phosphorus held by the bacteria; intimately mixing at least a part of the aerobically and anaerobically treated streams; holding said intimately mixed streams for a time sufficient to attain separation of bacteria containing solids from the aqueous stream; removing low bacteria and phosphorus solids content effluent from the held stream; removing high solids containing sludge from the held stream; and, recycling at least a portion of anaerobically stressed and aerobically enhanced bacteria containing sludge from said held stream to said aqueous influent stream.
2. The process of claim 1 wherein the recycled sludge is intimately mixed with the influent stream prior to dividing said stream.
3. The process of claim 1 wherein chemical precipitants are added.
4. The process of claim 3 wherein chemical precipitants are added during separation.
5. The process of claim 1 wherein the intimately mixed anaerobically and aerobically treated streams are held in a clarifier and subjected to gravimetric separation.
6. The process of claim 1 wherein the influent stream is divided into two separate streams.
7. The process of claim 6 wherein the two streams are concurrently treated.
8. The process of claim 1 when the influent stream is subjected to primary heavy solids separation prior to aerobic and anaerobic treatment.
9. The process of claim 8 wherein the anaerobic stressed and anaerobic enhanced bacteria are added to said influent stream prior to heavy solids separation.
10. The process of claim 1 wherein the anaerobic stressed and aerobic enhanced bacteria is added to the divided influent stream.
11. The process of claim 1 where said aerobic zone comprises more than about 3 ppm of oxygen.
12. The process of claim 1 wherein the treatment in said anaerobic zone includes the addition of a precipitant.
13. The process of claim 1 wherein the high solids containing sludge is concentrated.
14. The process of claim 13 wherein a supernatant liquid from the sludge concentration is recyled to the aqueous influent stream.
15. The process of claim 13 wherein chemical precipitants are added during sludge concentration.
Description

This invention relates to a novel process for treating phosphorus containing aqueous streams, particularly raw or primary treated sewage streams, to obtain a substantially phosphorus free effluent.

BACKGROUND OF THE INVENTION

The removal of phosphorus from effluent streams has taken on increasing importance in one modern world. The effect of phosphorus in waste sewage on the lakes and streams into which such sewage flows has been so serious that its removal has been a mandated requirement by multiple governmental authorities. When certain forms of phosphorus are present in lakes, rivers and streams, there is a significant increase in the growth of unwanted bacteria, algae and vegetation; which in turn acts to severely restrict the use that can be made of such waters, and can act to render such water useless, or, can deteriorate the health of man and his environment.

Many processes have been proposed for the removal of phosphorus from waste streams but most have been found to be either too ineffective, or to be too costly to be cost effective. Presently, the most frequently employed method of phosphorus removal is by precipitants. This process is achieved by the addition of metal oxides such as calcium, magnesium and sodium aluminate or by the addition of metal salts, such as chlorides and sulfates of aluminum and iron to the waste stream. Such chemicals can be added at various stages of the treatment process and have been found effective, but not without significant expense and the creation of additional problems.

The metal oxides typically used in such precipitant systems are strongly alkaline and effect a change in pH to the waste stream which may interfere with other processing functions or steps and often requires further treatment before returning such treated stream to the environment. Regulation of pH frequently requires additional equipment, sophisticated controls, further chemical treatment and additional operator attention. The metal salts also create problems in that they are typically strongly acidic. Dealing with them involves problems comparable to those resulting from the use of metal oxides except that an acid condition must be controlled. Additionally, the use of these chemicals requires accurate proportioning of chemical dosages to influent phosphorus loadings for efficient use of the chemicals. Sophisticated controls and/or continuing operator maintainance is required for efficient operation of such precipitant systems.

The use of the chemical precipitant method adds substantially to the cost of water treatment and increases the amount of sludge that must thereafter be disposed of. The precipitate formed in the use of metal salts is voluminous and does not compact well by the usual means employed. Consequently, the more metal salt used the greater the volume of sludge created. The use of metal oxides typically result in a cation contaminated effluent which remains in solution and can present a removal problem that eventually may be mandated for removal by governmental authority.

A promising, but less frequently employed method of phosphorus treatment comprises what is commonly known as the activated sludge process. In such process, biological growth colonies are typically developed in the waste water stream through treatment in the presence of oxygen. A biologically active sludge is thus formed which is recycled to the influent for biochemical reaction with the organisms in the influent to create bioprecipitation, adsorption, absorption and aqueous oxidation. The active microorganisms are periodically or continuously introduced to the reactor. Though such process appears at first glance to be an inexpensive and highly desirable means of removing phosphorus, the activated sludge process of the prior art have, in practice, been less efficient than desired and have required significant additions of precipitate to assure that a clear, substantially phosphorus free effluent, is attained. The low level of efficiency can be directly attributed to the limited phosphorus uptake by the bacteria in the waste stream being treated. By far, the most expensive element of an activated sludge process occurs when additional precipitating chemicals are required and it is not atypical that an activated sludge system may require the use of 50% or more of the chemical precipitant necessary in a phosphorus precipitation process, to obtain an acceptable phosphorus free effluent level.

One object of the instant invention is to improve the efficiency of the activated sludge process to attain greater phosphorus removal without the use of precipitants. Another object of the invention is to reduce the chemical cost of treating phosphorus containing sewage. A further object is to treat phosphorus containing sewage in such a manner which allows creation of an easily compactable sludge to reduce land fill requirements. These and other objects will be apparent from the following disclosure of the invention.

SUMMARY OF THE INVENTION

The invention generally comprises a method for removing phosphorus from waste water by intimately mixing and interacting streams which have been separately exposed to conflicting processing conditions. Such separate exposure and recombination of process streams which have been subjected to conflicting conditions results in an increased phosphorus take-up by the bacteria present in the combined stream and thus acts to provide a higher degree of phosphorus removal than typically experienced in an activated sludge treatment process. I have found, that as a result of the imposition of appropriate conflicting conditions on a process stream, that in most instances, no further chemical treatment need be applied to the system to attain efficient discharge falling well within regulatory standards. In situations where further chemical treatment is necessary, the amount of chemicals utilized is relatively low and within easily manageable levels.

DISCLOSURE OF THE INVENTION

I have found that a substantially phosphorus free effluent can be attained from an aqueous phosphorus containing stream by a relatively simple process, which exposes the stream to conflicting process conditions in such a manner as to cause bacteria contained therein to take-up and then precipitate the phosphorus in greater efficiency than previously thought possible. In my process an aqueous influent stream containing previously stressed and enhanced bacteria, phosphorus and biodegradable substances is divided into separate streams which are concurrently aerobically and anaerobically treated. The separately treated streams are then combined in intimate mixture and phosphorus containing bacteria are allowed to settle out. It is essential to the process that at least a portion of the enhanced bacteria contained in the combined stream be recycled to the incoming influent to assure high process efficiency.

Though I wish not to be bound by the following, I believe that when bacteria are initially subjected to an anaerobic zone they tend to take-up only a small amount of the total free phosphorus that might be available in the process stream. I have found that for some reason, when bacteria are exposed to alternate aerobic, anaerobic, aerobic and anaerobic conditions that the amount of free phosphorus taken-up in the second aerobic zone is much higher (enhanced) than that taken-up in the first aerobic zone. I believe that this is because the bacteria anticipate the recurrence of anaerobic stress and as a result seek to protect themselves from such stress by creating a larger energy sump in the form of phosphorus entrained. If the alternating aerobic, anaerobic, aerobic and anaerobic conditions are removed, the bacteria will generally lose the capacity to anticipate conditions and consequently will no longer take-up the extra phosphorus to create a phosphorus rich condition.

Thus, I have developed a process which seeks to maximize the anticipation of stress in bacteria, which in turn maximizes the uptake of phosphorus by the bacteria, putting the phosphorus into a form in which it can be easily removed from a process stream. To this end, I propose that to an incoming phosphorus containing stream there be added previously anaerobically stressed and aerobically enhanced bacteria. The stressed and enhanced bacteria is intimately mixed into the influent stream and provides a basis for anticipation by subsequent generated bacteria. The mixed stream is divided into at least two separate streams for separate treatment. At least one of the separate streams is treated in an aerobic zone, in the presence of sufficient oxygen, for a time sufficient to enhance the bacteria contained in the stream, to take-up free phosphorus in excess of their life support requirements. Another of the separate streams is concurrently treated in an anaerobic zone, under oxygen deficient conditions, for a time sufficient to stress the bacteria contained therein and cause release of phosphorus held by the bacteria. The relatively oxygen rich, but free-phosphorus deprived stream coming from the aerobic zone in then intimately mixed with the free-phosphorus rich, but oxygen depleted, stream coming from the anaerobic zone with the result being a rapid free-phosphorus takeup by the anaerobic treated bacteria in excess of its aerobically enhanced requirements. The system will tend toward a steady state and the already phosphorus-rich bacteria (aerobically enhanced), coming from the aerobic zone, will compete with the anaerobically stressed bacteria for the free phosphorus and the result will be a steady state system with entrained phosphorus at a higher level than normally aerobically enhanced.

The thus high efficiency entrained phosphorus stream is then held in a quiescent state to allow the settling of the phosphorus enriched bacteria. The heavy sludge portion is removed for solid waste treatment or can be in part recycled. The supernatant is generally clear and may be discharged without further treatment.

Generally, a high degree a mixing is necessary when combining the separate streams which have been concurrently anaerobically and aerobically treated. I feel that an adequate degree of mixing can be attained by utilizing an appropriate static mixer such as subsurface aeration, weirs, baffles and venturi type mixers. Generally, I prefer to utilize an aerating mixing means as it provides an additional aerobic treatment which can act to further increase the phosphorus uptake efficiency. Active mixing is generally the most convenient method and can also act to provide additional aerobic treatment by assuring distribution of entained oxygen. Multiple active mixers have been found suitable, including surface and subsurface, impeller mixers, shakers and the like. The most preferred mixing system comprises an active impeller mixer with aeration capacity.

The anaerobic zone can comprise a separate vessel, channel, pipe or the like and can be static or can comprise a flowing stream. It is preferred that an active current of some nature be maintained in the anaerobic zone to minimize settling of bacteria. Such current can be maintained by stream flow through the anaerobic zone, hydraulic turbulance, shaking, intermittant mixing and the like. A primary requirement in the anaerobic zone is the maintaining of a relatively oxygen free environment. For maximum efficiency of the process of the invention the anaerobic zone should contain less than approximately 1 ppm oxygen. For most purposes of my invention, I have found a closed vessel, with mechanical mixing means, to be a preferred anaerobic apparatus to achieve the objects of this invention.

The aerobic zone, as with the anaerobic zone, can comprise a separate vessel, channel, pipes and the like and can be static or can comprise a flowing stream. As with the anaerobic zone, a potential exists for the settling of phosphorus rich bacteria and it is desirable to maintain some aqueous current in the stream being treated. Equipment as previously described in the anaerobic zone can be effectively utilized for this purpose. A primary requirement of aerobic treatment is the maintaining of an oxygen rich environment and I find it preferable to maintain at least about 2 ppm and preferably more of oxygen to attain efficient phosphorus uptake. I find the most preferred level of environmental oxygen to be from about 3 or more ppm oxygen up to about saturation.

Generally the influent stream will contain adequate bacteria and biodegradable substrates to allow initiation of the process, but to attain efficient levels of phosphorus removal, recycling of previously stressed and enhanced bacteria generated in the aerobic zone by the process itself is necessary. I have generally found it appropriate to recycle a significant amount of bacteria to synergistically increase the phosphorus up-take activity of the original influent stream. Generally, the amount of bacteria recycled is based upon the desire to recycle bacteria at least once and probably twice or more through the system to attain adequate levels of anticipation by the bacteria. I have generally found it appropriate to continually mix the recycled bacteria laden sludge with the influent to maximize the efficiency of the process. Static and active mixers, as described for use in the previous paragraphs, have been found appropriate for such use.

Holding of the intimately mixed process streams can be achieved by multiple means. Generally it is adequate to hold the mixed stream in a large vessel sufficient to avoid a significant flow which could disrupt the gradual setting of the aqueous biomass. Generally, a detention time of about one hour or more is appropriate to obtain adequate separation of the biomass to form the activated sludge and to achieve a substantially clear, phosphorus free supernatant. The holding means can be by continuous or batch processing means but generally a continuous process in preferred. In such latter situations, weirs and baffles are incorporated into the vessel to assure efficient settling from the supernatant liquid prior to migration from the holding vessel.

Precipitants are not typically necessary for efficient operation of the process, but if desired they may be added at any point in the process. Generally they are preferrably added at the point of mixing of the separate streams or during the holding period. The prior art is replete with various precipitants that may be utilized and such is meant to be incorporated into my process.

Stressed and enhanced bacteria can be obtained at any point after the separate streams are mixed after flowing from the aerobic and anaerobic zones. A most preferred recycle sludge, however, is aged sludge from the holding tank.

The FIGURE is a flow diagram representing a sewage treatment process of the invention.

With reference to the FIGURE a raw sewage stream is typically introduced into the process at optional primary settling zone 1. This zone acts as a settlement station for easily settled heavy material such as sand, grit and the like which are typically removed from the raw sewage prior to treatment.

After appropriate settling of heavy material the raw, phosphorus containing, sewage stream to be treated by the process of this invention is intimately mixed in mixing zone 2, with a charge of previously stressed and enhanced bacteria supplied from holding zone 6. The intimately mixed raw sewage stream is divided into separate streams A and B, with stream A flowing to aerobic zone 3 and stream B flowing to anaerobic zone 4. After an appropriate reaction time the aerobically treated stream is recombined with the anaerobically treated stream at mixing zone 5 and the combined stream A/B is held in holding zone 6 to allow separation of the biomass. A clear supernatant is withdrawn from the top of holding zone 6 and may be directly discharged to an appropriate receiving facility with or without optional chlorination or the like.

The heavy sludge is withdrawn from the bottom and typically goes to concentration zone 7 and thereafter is subjected to compaction or other processing for land fill. A portion of the sludge is withdrawn and recycled to the influent for mixing in zone 2. The supernatant liquid from sludge concentration zone 7 can be optionally recycled to the aqueous influent for treatment.

The following examples are provided to explain the invention and are not meant to comprise a limitation thereto.

EXAMPLES

Primary treated, biodegradable solids containing, raw sewage inflowing at an average rate of about 27.2 million gallons per day, and containing an average about 4.50 ppm of phosphorus is intimately mixed, by means of subsurface impeller mixers, with recycled sludge containing previous anaerobically stressed and aerobically enhanced bacteria. The mixed process stream was divided into two separate streams of approximately equal volume. The first stream was fed to an aerobic chamber wherein it was aerated to an excess of oxygen above 5 ppm and maintained with a continuous flow. The second stream was fed to an anaerobic chamber wherein it was maintained in an oxygen deficient atmosphere of less than about 1 ppm of oxygen with a continuous flow. Both streams were maintained in their respective aerobic and anaerobic chambers for approximately one hour, were then recombined and intimately mixed by means of a subsurface aeration. The recombined and intimately mixed stream was then passed to a settling tank where clarified waste effluent, containing less than about 0.8 ppm phosphorus was discharged from the effluent overflow. The settled mixture of sludge was substantially aerobic at the interface with the supernatant and contained a very low concentration of soluble phosphorus. The lower portion of the sludge was a mixture of aerobic and facultative bacteria which were phosphorus enriched. The phosphorus enriched lower portion of the sludge was then chemically treated with ferrous sulphate. A portion of this sludge was concentrated and removed to a land fill. A second portion of this sludge was recycled to the influent primary treated stream. The average amount of ferrous ion required in the precipitant process to attain an effluent discharge of less than about 0.8 ppm phosphorus was about 0.14 pounds per pounds of phosphorus removed.

In a comparison with the process of the invention primary treated, biodegradable solids containing, raw sewage inflowing at an average rate of about 27.2 million gallons per day and containing about 4.50 ppm of phosphorus was intimately mixed with previously aerobically treated bacterial and facultative bacteria which were phosphorus enriched. The mixed stream was fed to an aerobic chamber wherein it was aerated to an excess of oxygen above 5 ppm for about one hour. The exiting stream was intimately mixed by means of subsurface aeration and was then passed to a settling tank where clarified waste effluent, containing less than about 0.8 ppm phosphorus was discharged from the effluent overflow. The phosphorus enriched lower portion was chemically treated with ferrous sulphate. A portion of the sludge was recycled to the influent primary treated stream. The average amount of ferrous ion required in the precipitation process to attain an effluent discharge of less than about 0.8 ppm phosphorus was 0.44 pounds of ferrous ion for each pound of phosphorus removed.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4279753 *Mar 19, 1979Jul 21, 1981Arco Environmental CompanyWastewater treatment system including multiple stages of alternate aerobic-anerobic bioreactors in series
US4431543 *Apr 7, 1982Feb 14, 1984Ebara Infilco Kabushiki KaishaMethod of removing phosphorus from organic waste liquids
US4460470 *Feb 23, 1983Jul 17, 1984Linde AktiengesellschaftProcess and apparatus for the biological purification of phosphate-containing wastewater
US4488968 *Mar 7, 1983Dec 18, 1984Air Products And Chemicals, Inc.Removal of phosphates and BOD from wastewaters
US4522722 *Mar 7, 1983Jun 11, 1985Air Products And Chemicals, Inc.Nitrogen and phosphorus removal from wastewater
US4559142 *Feb 10, 1984Dec 17, 1985Linde AktiengesellschaftSplit feed for the anaerobic biological purification of wastewater
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4874519 *Aug 30, 1988Oct 17, 1989Orange Water & Sewer AuthorityProcess for treating wastewater
US5344562 *Mar 3, 1993Sep 6, 1994Gunter LorenzBiological dephosphatization and (de)nitrification
US5725772 *Oct 13, 1995Mar 10, 1998Shirodkar; Nikhil M.Wastewater treatment system
US6039874 *Oct 6, 1998Mar 21, 2000Ajt & Associates, Inc.Apparatus and method for purification of agricultural animal waste
US6193889Feb 17, 1999Feb 27, 2001Agrimond, L.L.C.Apparatus and method for purification of agricultural animal waste
US6395174Feb 15, 2000May 28, 2002Agrimond, L.L.C.Method for lagoon remediation
US6398959Mar 24, 2000Jun 4, 2002Agrimond, LlcAerobic treatment of liquids to remove nutrients and control odors
US6554998May 1, 2002Apr 29, 2003Agrimond, LlcApparatus for lagoon remediation
US6599424May 1, 2002Jul 29, 2003Agrimond, LlcMethod for lagoon remediation
US6689274Nov 10, 2000Feb 10, 2004Bion Technologies, Inc.Low oxygen organic waste bioconversion system
US6824682Dec 17, 2002Nov 30, 2004Best Biofuels Llc C/O Smithfield Foods, Inc.System and method for extracting energy from agricultural waste
US6908495Jun 20, 2003Jun 21, 2005Bion Technologies, Inc.Low oxygen organic waste bioconversion system
US6982036May 24, 2004Jan 3, 2006Ch2M Hill, Inc.Chemically enhanced primary sludge fermentation method
US7169821Oct 28, 2004Jan 30, 2007Best Biofuels Llc C/O Smithfield Foods, Inc.System and method for extracting energy from agricultural waste
US7431839Apr 15, 2005Oct 7, 2008Bion Technologies, Inc.Low oxygen biologically mediated nutrient removal
US7445707May 11, 2005Nov 4, 2008Envirolytic Technologies, LlcWaste effluent treatment system
US7485230 *Mar 8, 2007Feb 3, 2009Magner Joseph AIntegrated cogeneration wastewater sewage and waste polar fats/ oils/ greases/waxes (FOG) waste treatment method and facility
US7552827Oct 10, 2006Jun 30, 2009Envirolytic Technologies, LlcSystems and methods of separating manure from a manure and bedding mixture
US7569148Aug 23, 2007Aug 4, 2009Siemens Water Technologies Corp.Continuous membrane filtration and solids reduction
US7575685Nov 3, 2006Aug 18, 2009Bion Technologies, Inc.Low oxygen biologically mediated nutrient removal
US7833414Aug 28, 2009Nov 16, 2010Magner JosephPolar fog waste treatment
US7879589Aug 17, 2009Feb 1, 2011Bion Technologies, Inc.Micro-electron acceptor phosphorus accumulating organisms
US7927493May 12, 2008Apr 19, 2011Ch2M Hill, Inc.Low phosphorus water treatment methods
US7931808Jun 9, 2009Apr 26, 2011Siemens Water Technologies Corp.Sequencing batch reactor with continuous membrane filtration and solids reduction
US8039242Jan 28, 2011Oct 18, 2011Bion Technologies, Inc.Low oxygen biologically mediated nutrient removal
US8105490Apr 15, 2011Jan 31, 2012Ch2M Hill, Inc.Low phosphorus water treatment systems
US8721887Dec 7, 2010May 13, 2014Ch2M Hill, Inc.Method and system for treating wastewater
US20030111410 *Dec 17, 2002Jun 19, 2003Branson Jerrel DaleSystem and method for extracting energy from agricultural waste
US20040079698 *Jun 20, 2003Apr 29, 2004Jere NorthropLow oxygen organic waste bioconversion system
US20040144718 *Dec 3, 2003Jul 29, 2004Manfred RickProcess and plant for cleaning waste water
US20050016920 *May 24, 2004Jan 27, 2005Ch2M Hill, Inc.Chemically enhanced primary sludge fermentation method
US20050113467 *Oct 28, 2004May 26, 2005Branson Jerrel D.System and method for extracting energy from agricultural waste
US20050242026 *Apr 15, 2005Nov 3, 2005Morris James WLow oxygen biologically mediated nutrient removal
US20060065595 *May 11, 2005Mar 30, 2006Thomas MenkeWaste effluent treatment system and process
US20070144965 *Nov 3, 2006Jun 28, 2007Morris James WLow oxygen biologically mediated nutrient removal
US20080028675 *Jul 25, 2007Feb 7, 2008Nbe,LlcBiomass treatment of organic waste materials in fuel production processes to increase energy efficiency
US20080035036 *Nov 3, 2006Feb 14, 2008Bassani Dominic TEnvironmentally compatible integrated food and energy production system
US20080083659 *Oct 10, 2006Apr 10, 2008Envirolytic Technologies, LlcSystems and methods of separating manure from a manure and bedding mixture
US20080203014 *Mar 8, 2007Aug 28, 2008Magner Joseph AIntegrated cogeneration wastewater sewage and waste polar fats/ oils/ greases/waxes (fog) waste treatment method and facility
US20080240175 *Sep 26, 2006Oct 2, 2008Bookham Technology PlcBragg Grating Reflection Strength Control
US20080302723 *May 12, 2008Dec 11, 2008Ch2M Hill, Inc.Low phosphorous water treatment methods and systems
US20090261027 *Jun 9, 2009Oct 22, 2009Siemens Water Technologies Corp.Sequencing batch reactor with continuous membrane filtration and solids reduction
US20090305386 *Aug 17, 2009Dec 10, 2009Morris James WLow oxygen biologically mediated nutrient removal
US20090314709 *Aug 28, 2009Dec 24, 2009Magner JosephPolar fog waste treatment
US20110129900 *Jan 28, 2011Jun 2, 2011Morris James WLow oxygen biologically mediated nutrient removal
US20110192776 *Apr 15, 2011Aug 11, 2011Ch2M Hill, Inc.Low phosphorus water treatment systems
Classifications
U.S. Classification210/607, 210/630, 210/903, 210/622
International ClassificationC02F3/30, C02F3/12
Cooperative ClassificationY02W10/15, Y10S210/903, C02F3/1215, C02F3/308
European ClassificationC02F3/12A4, C02F3/30F
Legal Events
DateCodeEventDescription
Apr 17, 1987ASAssignment
Owner name: ZABION, LTD., 1961 TONAWANDA CREEK RD., NORTH TONA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:NORTHROP, JERE;REEL/FRAME:004694/0138
Effective date: 19870330
Aug 27, 1991REMIMaintenance fee reminder mailed
Oct 25, 1991FPAYFee payment
Year of fee payment: 4
Oct 25, 1991SULPSurcharge for late payment
Sep 5, 1995REMIMaintenance fee reminder mailed
Jan 25, 1996SULPSurcharge for late payment
Jan 25, 1996FPAYFee payment
Year of fee payment: 8
Aug 17, 1999REMIMaintenance fee reminder mailed
Dec 16, 1999SULPSurcharge for late payment
Dec 16, 1999FPAYFee payment
Year of fee payment: 12
May 12, 2003ASAssignment
Owner name: BRIGHT CAPITAL, LTD., NEW YORK
Free format text: SECURITY AGREEMENT;ASSIGNORS:BION ENVIRONMENTAL TECHNOLOGIES, INC.;BION TECHNOLOGIES, INC.;BION SOIL, INC.;REEL/FRAME:014059/0065
Effective date: 20030507
Sep 29, 2003ASAssignment
Owner name: BLITZ, HARVEY, NEW YORK
Free format text: SECURITY INTEREST;ASSIGNORS:BION DAIRY CORPORATION, A COLORADO CORPORATION;BION TECHNOLOGIES, INC.,A COLORADO CORPORATION;BIONSOIL, INC., A COLORADO CORPORATION;AND OTHERS;REEL/FRAME:014539/0951
Effective date: 20030826
Owner name: CASADONTE, VIRGINIA, NEW YORK
Free format text: SECURITY INTEREST;ASSIGNORS:BION DAIRY CORPORATION, A COLORADO CORPORATION;BION TECHNOLOGIES, INC.,A COLORADO CORPORATION;BIONSOIL, INC., A COLORADO CORPORATION;AND OTHERS;REEL/FRAME:014539/0951
Effective date: 20030826
Owner name: CHRIS-DAN, LLC (DOMINIC), NEW YORK
Free format text: SECURITY INTEREST;ASSIGNORS:BION DAIRY CORPORATION, A COLORADO CORPORATION;BION TECHNOLOGIES, INC.,A COLORADO CORPORATION;BIONSOIL, INC., A COLORADO CORPORATION;AND OTHERS;REEL/FRAME:014539/0951
Effective date: 20030826
Owner name: DENNIS ROSEN MD PROFIT SHARING PLAN, NEW YORK
Free format text: SECURITY INTEREST;ASSIGNORS:BION DAIRY CORPORATION, A COLORADO CORPORATION;BION TECHNOLOGIES, INC.,A COLORADO CORPORATION;BIONSOIL, INC., A COLORADO CORPORATION;AND OTHERS;REEL/FRAME:014539/0951
Effective date: 20030826
Owner name: ELLEN GILBERTSON, TRUSTEE, LAWRENCE PODELL IRREV T
Free format text: SECURITY INTEREST;ASSIGNORS:BION DAIRY CORPORATION, A COLORADO CORPORATION;BION TECHNOLOGIES, INC.,A COLORADO CORPORATION;BIONSOIL, INC., A COLORADO CORPORATION;AND OTHERS;REEL/FRAME:014539/0951
Effective date: 20030826
Owner name: KIRSCH, JODI, NEW YORK
Free format text: SECURITY INTEREST;ASSIGNORS:BION DAIRY CORPORATION, A COLORADO CORPORATION;BION TECHNOLOGIES, INC.,A COLORADO CORPORATION;BIONSOIL, INC., A COLORADO CORPORATION;AND OTHERS;REEL/FRAME:014539/0951
Effective date: 20030826
Owner name: LEVINGER, GEORGE, MASSACHUSETTS
Free format text: SECURITY INTEREST;ASSIGNORS:BION DAIRY CORPORATION, A COLORADO CORPORATION;BION TECHNOLOGIES, INC.,A COLORADO CORPORATION;BIONSOIL, INC., A COLORADO CORPORATION;AND OTHERS;REEL/FRAME:014539/0951
Effective date: 20030826
Owner name: MAGER, DAVID, MASSACHUSETTS
Free format text: SECURITY INTEREST;ASSIGNORS:BION DAIRY CORPORATION, A COLORADO CORPORATION;BION TECHNOLOGIES, INC.,A COLORADO CORPORATION;BIONSOIL, INC., A COLORADO CORPORATION;AND OTHERS;REEL/FRAME:014539/0951
Effective date: 20030826
Owner name: MITCHELL, DAVID J., NEW YORK
Free format text: SECURITY INTEREST;ASSIGNORS:BION DAIRY CORPORATION, A COLORADO CORPORATION;BION TECHNOLOGIES, INC.,A COLORADO CORPORATION;BIONSOIL, INC., A COLORADO CORPORATION;AND OTHERS;REEL/FRAME:014539/0951
Effective date: 20030826
Owner name: ORPHANOS, ANTHONY G., NEW YORK
Free format text: SECURITY INTEREST;ASSIGNORS:BION DAIRY CORPORATION, A COLORADO CORPORATION;BION TECHNOLOGIES, INC.,A COLORADO CORPORATION;BIONSOIL, INC., A COLORADO CORPORATION;AND OTHERS;REEL/FRAME:014539/0951
Effective date: 20030826
Owner name: POSNER, STEPHEN J., NEW YORK
Free format text: SECURITY INTEREST;ASSIGNORS:BION DAIRY CORPORATION, A COLORADO CORPORATION;BION TECHNOLOGIES, INC.,A COLORADO CORPORATION;BIONSOIL, INC., A COLORADO CORPORATION;AND OTHERS;REEL/FRAME:014539/0951
Effective date: 20030826
Owner name: STIFEL NICOLAUS CUSTODIAN FOR JONATHAN BERG IRA AC
Free format text: SECURITY INTEREST;ASSIGNORS:BION DAIRY CORPORATION, A COLORADO CORPORATION;BION TECHNOLOGIES, INC.,A COLORADO CORPORATION;BIONSOIL, INC., A COLORADO CORPORATION;AND OTHERS;REEL/FRAME:014539/0951
Effective date: 20030826
Aug 6, 2004ASAssignment
Owner name: BLITZ, HARVEY, NEW YORK
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BION DAIRY CORPORATION;REEL/FRAME:015642/0428
Effective date: 20030826
Apr 21, 2006ASAssignment
Owner name: BION TECHNOLOGIES, INC., A COLORADO CORPORATION, C
Free format text: SECURITY AGREEMENT;ASSIGNORS:BLITZ, HARVEY;GILBERTSON, ELLEN, TRUSTEE LAWRENCE PODELL IRREV TRUST U/A DTD 8/27/91;CASADONTE, VIRGINIA;AND OTHERS;REEL/FRAME:017519/0251
Effective date: 20050930
Owner name: BION DAIRY CORPORATION, A COLORADO CORPORATION, CO
Free format text: SECURITY AGREEMENT;ASSIGNORS:BLITZ, HARVEY;GILBERTSON, ELLEN, TRUSTEE LAWRENCE PODELL IRREV TRUST U/A DTD 8/27/91;CASADONTE, VIRGINIA;AND OTHERS;REEL/FRAME:017519/0251
Effective date: 20050930
Owner name: BIONSOIL, INC., A COLORADO CORPORATION, COLORADO
Free format text: SECURITY AGREEMENT;ASSIGNORS:BLITZ, HARVEY;GILBERTSON, ELLEN, TRUSTEE LAWRENCE PODELL IRREV TRUST U/A DTD 8/27/91;CASADONTE, VIRGINIA;AND OTHERS;REEL/FRAME:017519/0251
Effective date: 20050930
Owner name: BION ENVIRONMENTAL TECHNOLOGIES, INC., A PUBLICLY-
Free format text: SECURITY AGREEMENT;ASSIGNORS:BLITZ, HARVEY;GILBERTSON, ELLEN, TRUSTEE LAWRENCE PODELL IRREV TRUST U/A DTD 8/27/91;CASADONTE, VIRGINIA;AND OTHERS;REEL/FRAME:017519/0251
Effective date: 20050930